Heat stable milk protein product and method for its manufacturing

ABSTRACT

The present invention relates to a heat stable milk protein product. Particularly, the invention relates to a heat stable milk protein product which can be used as a meat substitute that can be heated by microwaves, fried or grilled. The present invention relates also processes for producing such heat stable milk protein products.

This application is the U.S. national phase of International ApplicationNo. PCT/FI2017/050931 filed Dec. 22, 2017 which designated the U.S. andclaims priority to FI Patent Application No. 20166019 filed Dec. 22,2016, the entire contents of each of which are hereby incorporated byreference.

FIELD OF THE INVENTION

The present invention relates to a heat stable milk protein product.Particularly, the invention relates to a heat stable milk proteinproduct which can be used as a cheese or a meat substitute that can beheated by microwaves, fried or grilled. The present invention relatesalso processes for producing such heat stable milk protein products.

BACKGROUND OF THE INVENTION

There is currently a continuous need for meat substituting proteinproducts in the market. Meat substitutes are food products thatapproximate the aesthetic qualities and/or chemical characteristics ofcertain types of meat. Meat substitutes include, i.a., variousvegetarian products, such as soybean flour, soybean sausages, tofu,tempeh, quorn, or meatless-based alternatives, such as minced soyprotein TSP (textured soy protein), or bean curd, etc. The meatsubstitute does not contain meat or any component of meat origin but canbe used as meat, like fried.

There are cheeses in the market which can be fried and grilled. Typicalexamples of such cheese are halloumi, queso blanco and mozzarella, whichare traditional fresh cheeses made of milk by coagulating casein withrennet, citric acid or a combination of a starter and rennet,respectively.

Publication WO 2014/001636 discloses a method for producing cheesegrains which are stable for frying and can be eaten as such, fried orused as a meat substitute.

BRIEF DESCRIPTION OF THE INVENTION

The present invention relates to a heat stable milk protein product inthe form of a block, a cube, a mince, a slice, a stripe, a grain, ablock pressed from the cubes, minces, slices, stripes and/or grainswhich can be eaten as such or used as a meat substitute like minced meator meat after frying and grilling, for example. The texture of the heatstable milk protein product is not thermoplastic. The microstructure ofthe product is in nanolevel fibrous which is not visible. Microfibersare formed during the manufacturing process and they are stable duringthe storage of the product. The heat stable milk protein product of theinvention does not melt when fried and/or do not scorch onto frying warewhen fried.

The protein content of the heat stable milk protein product of thepresent invention varies within a range of about 10% to about 55% andthe fat content of the product varies within a range of about 0% toabout 20%. The lactose content of the product varies within a range ofabout 0% to about 5%. The pH of the product is in the range of about 5.2to about 5.9.

In addition, the present invention relates to a process formanufacturing a heat stable milk protein product. In one embodiment, theprocess for manufacturing the heat stable milk protein product of thepresent invention comprises the steps of:

-   -   a) providing a cheese    -   b) optionally providing a native casein concentrate,    -   c) providing a hydrocolloid raw material,    -   d) providing a protein crosslinking enzyme,    -   e) crumbling the cheese,    -   f) mixing the crumbled cheese, the hydrocolloid raw material and        optionally the casein concentrate,    -   g) subjecting the mixture to a heat treatment,    -   h) cooling the heat treated mixture    -   i) adding a protein crosslinking enzyme to the mixture to form a        product mass,    -   j) optionally adding a lactase to the mixture,    -   k) optionally adjusting the pH of the product to a range of 5.2        to 5.9,    -   l) optionally cutting the formed product mass into desired form,        such as a block, a cube a stripe, a mince, a grain or a slice,    -   f) optionally seasoning and/or packing the product mass.

In one embodiment, the process for manufacturing the heat stable milkprotein product of the present invention comprises the steps of:

-   -   a) providing crumbled cheese,    -   b) optionally providing a native casein concentrate,    -   c) providing a hydrocolloid raw material,    -   d) providing a protein crosslinking enzyme,    -   e) mixing the crumbled cheese, the hydrocolloid raw material and        optionally the casein concentrate,    -   f) subjecting the mixture to a heat treatment,    -   g) cooling the heat treated mixture,    -   h) adding a protein crosslinking enzyme to the mixture to form a        product mass,    -   i) optionally adding a lactase to the mixture,    -   j) optionally adjusting the pH of the product to a range of 5.2        to 5.9,    -   k) optionally cutting the formed product mass into desired form,        such as a block, a cube, a stripe, a mince, a grain or a slice,    -   l) optionally seasoning and/or packing the product mass.

In one embodiment, the process for manufacturing the heat stable proteinproduct of the present invention comprises an additional step of:

-   -   a1) manufacturing the cheese, and/or    -   a2) manufacturing the native casein concentrate.

The objects of the invention are achieved by methods and compositionscharacterized by what is stated in the independent claims. The preferredembodiments of the invention are disclosed in the dependent claims.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 shows a SDS-page, which shows protein profiles of the followingcompositions:

-   MW STD: molecular weight standard,-   Sample 1: the heat stable milk protein product of Example 3,-   Sample 2: the intermediate product of Example 3 taken before the    addition of transglutaminase,-   Sample 3: cheese ripened for 21 days.

DETAILED DESCRIPTION OF THE INVENTION

In the present invention, it was surprisingly found that a heat stablemilk protein product can be obtained using raw materials comprisingconventional cheese in crumbled form, optionally a native caseinconcentrate, a protein crosslinking enzyme, and a hydrocolloid. Theobtained product can be used as such or in the form of a block, a cube,a mince, a stripe, a slice or a grain, all being stable for heating on afrying-pan or by microwaves.

Thus, the invention is based on a finding, that using crumbled cheese, aprotein crosslinking enzyme, a hydrocolloid and optionally a nativecasein concentrate, a heat stable milk protein product can be produced.The product obtained in the present invention does not melt when friedon a hot fry-pan or a grill or when heated with microwaves. The productcan also be frozen before frying and they stay heat stable.

Accordingly, the present invention relates to a process formanufacturing a heat stable milk protein product comprising the stepsof:

-   -   a) providing a cheese    -   b) optionally providing a native casein concentrate,    -   c) providing a hydrocolloid raw material,    -   d) providing a protein crosslinking enzyme,    -   e) crumbling the cheese,    -   f) mixing the crumbed cheese, the hydrocolloid raw material and        optionally the casein concentrate,    -   g) subjecting the mixture to a heat treatment,    -   h) cooling the heat treated mixture,    -   i) adding a protein crosslinking enzyme to the mixture to form a        product mass,    -   j) optionally adding a lactase to the mixture,    -   k) optionally adjusting the pH of the product to a range of 5.2        to 5.9,    -   l) optionally cutting the formed product mass into desired form,        such as a block, a cube, a stripe, a mince a grain or a slice,    -   m) optionally seasoning and/or packing the product mass.

In one embodiment, the process for manufacturing the heat stable milkprotein product of the present invention comprises the steps of:

-   -   a) providing crumbled cheese,    -   b) optionally providing a native casein concentrate,    -   c) providing a hydrocolloid raw material,    -   d) providing a protein crosslinking enzyme,    -   e) mixing the crumbled cheese, the hydrocolloid raw material and        optionally the casein concentrate,    -   f) subjecting the mixture to a heat treatment,    -   g) cooling the heat treated mixture,    -   h) adding a protein crosslinking enzyme to the mixture to form a        product mass,    -   i) optionally adding a lactase to the mixture,    -   j) optionally adjusting the pH of the product to a range of 5.2        to 5.9,    -   k) optionally cutting the formed product mass into desired form,        such as a block, a cube, a stripe, a mince a grain or a slice,    -   l) optionally seasoning and/or packing the product mass.

In one embodiment, the process for manufacturing the heat stable proteinproduct of the present invention comprises an additional step of:

-   -   a1) manufacturing the cheese, and/or    -   a2) manufacturing the native casein concentrate.

Accordingly, in one embodiment, the process for manufacturing the heatstable milk protein product of the present invention comprises the stepsof:

-   -   a1) manufacturing a cheese, and    -   a2) manufacturing a native casein concentrate,        -   a) crumbling the cheese,        -   b) providing a hydrocolloid raw material,        -   c) providing a protein crosslinking enzyme,        -   d) mixing the crumbled cheese, the casein concentrate and            the hydrocolloid raw material,        -   e) subjecting the mixture to a heat treatment,        -   f) cooling the heat treated mixture,        -   g) adding a protein crosslinking enzyme to the mixture to            form a product mass,        -   h) optionally adding a lactase to the mixture,        -   i) optionally adjusting the pH of the product to a range of            5.2 to 5.9,        -   j) optionally cutting the formed product mass into desired            form, such as a block, a cube, a stripe, a mince, a grain or            a slice,        -   k) optionally seasoning and/or packing the product mass.

In one embodiment, the process for manufacturing the heat stable milkprotein product of the present invention comprises the steps of:

-   -   a1) manufacturing a cheese,        -   a) crumbling the cheese,        -   b) optionally providing a native casein concentrate,        -   c) providing a hydrocolloid raw material,        -   d) providing a protein crosslinking enzyme,        -   e) mixing the crumbled cheese, the hydrocolloid raw material            and optionally the native casein concentrate,        -   f) subjecting the mixture to a heat treatment,        -   g) cooling the heat treated mixture,        -   h) adding a protein crosslinking enzyme to the mixture to            form a product mass,        -   i) optionally adding a lactase to the mixture,        -   j) optionally adjusting the pH of the product to a range of            5.2 to 5.9,        -   k) optionally cutting the formed product mass into desired            form, such as a block, a cube, a stripe, a mince, a grain or            a slice,        -   l) optionally seasoning and/or packing the product mass.

In one embodiment, the process for manufacturing the heat stable milkprotein product of the present invention comprises the steps of:

-   -   a2) manufacturing the native casein concentrate,        -   a) providing a cheese,        -   b) providing the native casein concentrate,        -   c) providing a hydrocolloid raw material,        -   d) providing a protein crosslinking enzyme,        -   e) crumbling the cheese,        -   f) mixing the crumbled cheese, the native casein concentrate            and the hydrocolloid raw material,        -   g) subjecting the mixture to a heat treatment,        -   h) cooling the heat treated mixture,        -   i) adding a protein crosslinking enzyme to the mixture to            form a product mass,        -   j) optionally adding a lactase to the mixture,        -   k) optionally adjusting the pH of the product to a range of            5.2 to 5.9,        -   l) optionally cutting the formed product mass into desired            form, such as a block, a cube, a stripe, a mince, a grain or            a slice,        -   m) optionally seasoning and/or packing the product mass.

In one embodiment, the process for manufacturing the heat stable milkprotein product of the present invention comprises the steps of:

-   -   a2) manufacturing a native casein concentrate,        -   a) providing a crumbled cheese,        -   b) providing the native casein concentrate,        -   c) providing a hydrocolloid raw material,        -   d) providing a protein crosslinking enzyme,        -   e) mixing the crumbled cheese, the casein concentrate and            the hydrocolloid raw material,        -   f) subjecting the mixture to a heat treatment,        -   g) cooling the heat treated mixture,        -   h) adding a protein crosslinking enzyme to the mixture to            form a product mass,        -   i) optionally adding a lactase to the mixture,        -   j) optionally adjusting the pH of the product to a range of            5.2 to 5.9,        -   k) optionally cutting the formed product mass into desired            form, such as a block, a cube a stripe, a mince, a grain or            a slice,        -   l) optionally seasoning and/or packing the product mass.

In one embodiment, the native casein concentrate is produced from a milkraw material, such as skimmed milk by different membrane techniques,such as microfiltration, ultrafiltration, nanofiltration, reverseosmosis or their combinations. The membrane filtrations, such asultrafiltration and microfiltration, can be performed with diafiltrationtechnique. The filtration techniques are carried out utilizing methodsknown to the person skilled in the art. In one embodiment, the caseinconcentrate is produced from skimmed milk by microfiltration. Themicrofiltration of the milk raw material retains major portion of thecasein in the retentate whereas major portion of the whey proteinspasses into the permeate. The casein concentrate thus produced can befurther concentrated by ultrafiltration. In one embodiment, the caseinconcentrate is produced from skimmed milk by microfiltration andultrafiltration. In one embodiment, the casein concentrate is producedfrom skimmed milk by microfiltration and evaporation. In one embodiment,the casein concentrate is produced from skimmed milk by microfiltration,evaporation and spray or freeze drying. The casein molecules maintaintheir native form in the filtration procedures.

In one embodiment, the casein concentrate contains about 8.5%-about 20%(w/w) caseins, the total protein content being about 9.15%-about 22%(w/w). In one embodiment, total protein content of the caseinconcentrate is about 9.15%-about 22% (w/w) of which about 8.5%-about 20%(w/w), respectively, are caseins. In one embodiment, the caseinconcentrate contains about 8.5%-about 20% (w/w) caseins, the totalprotein content being about 9.15%-about 22% (w/w), and about 0.7%-about2.1% (w/w) carbohydrates, of which about 0.4%-about 1.2% (w/w) islactose. In one embodiment, the casein concentrate contains about8.5%-about 20% (w/w) caseins, the total protein content being about9.15%-about 22% (w/w), about 0-about 0.02% (w/w) fat, about 0.7%-about2.1% (w/w) carbohydrates, about 0.4%-about 1.2% (w/w) lactose, about0.85%-about 2.3% (w/w) ash, about 2500-7500 mg/kg calcium and about80-240 mg/kg sodium. In one embodiment, the casein concentrate containsabout 8.5% (w/w) caseins, the total protein content being about 9.15%(w/w). In one embodiment, the casein concentrate contains about 20%(w/w) caseins, the total protein content being about 22% (w/w). In oneembodiment, the casein concentrate contains about 8.5% (w/w) caseins,the total protein content being about 9.15% (w/w) and about 0.7% (w/w)carbohydrates of which about 0.4% (w/w) is lactose. In one embodiment,the casein concentrate contains about 8.5% (w/w) caseins, the totalprotein content being about 9.15% (w/w), about 0.08% (w/w) fat, about0.7% (w/w) carbohydrates, about 0.4% (w/w) lactose, about 0.85% (w/w)ash, about 2500 mg/kg calcium and 80 mg/kg sodium. The caseinconcentrate can be in the form of a liquid concentrate or a powder. Inone embodiment, the native casein concentrate is in a liquid form. Inone embodiment, the native casein concentrate is in a powder form. Thenative casein concentrate powder contains about 70.3% caseins, the totalprotein content being about 76.3%, about 3.3% lactose, the totalcarbohydrate content being 5.8%, about 0.7% fat about 20800 mg/kgcalcium, about 660 mg/kg sodium, and about 7.1% ash. The caseinmolecules in the casein concentrate of the present invention are intheir native/intact form.

In one embodiment, the casein fraction can be derived and/or producedfrom fresh milk by microfiltration. The casein fraction can optionallybe concentrated by filtration, evaporation or drying.

In the present invention, the cheese can be any type of ripened cheese.In the present invention, the cheese is produced by traditionalmanufacturing technology by using both rennet and starters. Ready cheeseblock is salted in brine or surface salted. In the present invention,cheese can be also produced by using instead of starters chemicalacidification together with rennet. The ROV of the cheese (moisture onthe fat free basis, MFFB) can vary widely. The ripening time of thecheese is not limited. The level of fat can typically vary from 10 to30% and the salt content can be in the range of 0.7-1.7%.

In the present invention, the hydrocolloid raw material is selected frompectin, gelatin, starch, starch hydrolysates, xanthan gum, gum arabic,guar gum, gellan gum, acacia, agar agar, alginates, konjac, mannan,pullulan, carob, beta glucan, carrageen, polydextrose, cellulose and/orcellulose derivatives. The amount of the hydrocolloid(s) used in theprocess depends on the characteristics of the hydrocolloid(s) and/oramounts of the other components of the protein product, for example. Theprotein product of the present invention contains at least onehydrocolloid. In one embodiment, the hydrocolloid is calcium alginate orsodium alginate. In one embodiment, the amount of the hydrocolloid is inthe range of 0.5-10% (w/w) based on the weight of the composition of theprotein product. In one embodiment, the amount of the hydrocolloid is inthe range of 3.4 to 4.3% (w/w) based on the weight of the composition ofthe protein product. In one embodiment, the amount of the hydrocolloidis about 4.1% (w/w) based on the weight of the composition of theprotein product.

The product mass is formed by mixing the crumbled cheese, thehydrocolloid raw material and optionally the casein concentrate. Mixingby stretching effects the fibre formation. Mixing may be done forexample by a double screw cooking mixer or a cooking extruder withoutlimiting to these.

In one embodiment of the present invention the mixture of the crumbledcheese, the hydrocolloid raw material and optionally the caseinconcentrate is subjected to a heat-treatment before the addition of aprotein crosslinking enzyme. In one embodiment of the present inventionthe mixture of the crumbled cheese, the hydrocolloid raw material andoptionally the casein concentrate is subjected to a heat-treatment afterthe addition of a protein crosslinking enzyme. In the method of theinvention, the heat-treatment is performed using methods known per se.Typical heat-treatments include heating at a temperature of 60-95° C. Inone embodiment, the heat-treatment is performed at a temperature of80-90° C. in order to inactivate the inhibitors of the cross-linkingenzymes, harmful bacteria and/or harmful enzymes present in the rawmaterials. The heat-treatment time varies typically from about 2 minutesto about 2 hours.

After the heat-treatment, the mixture is cooled to a temperature ofabout 5-55° C.

The protein crosslinking enzyme suitable for use in the method of theinvention may be any enzyme that is known to crosslink milk proteins.These enzymes include transglutaminase, tyrosinase and laccase, forexample. Said enzymes can be used alone or in any combinations with eachother. The enzyme is typically used in an amount of 0.2 U enzyme/gprotein to about 20 U enzyme/g protein, preferably about 2 U enzyme/gprotein.

In an embodiment of the invention, the protein crosslinking enzyme istransglutaminase (EC 2.3.2.13). It is commonly known thattransglutaminase catalyzes the generation of covalent linkages betweenthe glutamine and lysine amino acid residues present in the proteinmolecules. Of milk proteins, caseins, in particular κ-casein, are thebest substrates for a transglutaminase. β-casein, too, is rich inglutamine and lysine that the enzyme links together. Transglutaminasecan be any transglutaminase commonly used in dairy industry. It can bederived from a microbial source, fungus, mould, fish and a mammal. In anembodiment of the invention, transglutaminase is isolated from amicrobial source. There are several commercially availabletransglutaminase enzyme preparations that are suitable for use in theprocess of the invention. These include Activa® YG (Ajinomoto, Japan),Activa® MP (Ajinomoto, Japan), and Yiming-TG (Yiming Fine Chemicals Co.,Ltd., China). In one embodiment, the enzyme preparation is in a liquidform. In one embodiment, the liquid enzyme preparation is manufacturedby Valio Oy, Finland. In one embodiment, the liquid transglutaminaseenzyme preparation has crosslinking activity of about 100 U/g. In oneembodiment, the transglutaminase preparation is used in an amount ofabout 2.0-5.0 U/g protein. In one embodiment, the transglutaminasepreparation is used in an amount of about 2.0 U/g protein. Optimumconditions depend on the enzyme used and they can be obtained from themanufacturers of the commercial enzymes.

In another embodiment, the crosslinking enzyme is selected from laccaseand/or tyrosinase. Laccases (EC 1.10.3.2), derived from fungi andbacteria, such as, fungus Trametes hirsute, catalyze the crosslinkingbetween carbohydrates and proteins (oxidation of aromatic compounds andcysteine) with applications in food processing for reduction ofallergenicity, for example. Tyrosinases (EC 1.14.18.1) are enzymes whichcatalyzes the oxidation of phenols such as tyrosine, with applicationsin food processing for reduction of allergenicity, for example.Tyrosinases can be derived from a variety of plant, animal and fungalspecies, i.e. filamentous fungus Trichoderma reesei. Optimum conditionsdepend on the enzyme used and they can be obtained from themanufacturers of the commercial enzymes.

In one embodiment, the process comprises a step wherein lactose ishydrolysed. There are several different commercially available lactaseenzymes (ß-D-galactosidases). These include for instance enzymesproduced with the Kluyveromyces fragilis strain, such as HA lactase(Chr. Hansen A/S, Denmark), or enzymes produced with the Kluyveromyceslactis strain, such as Validase (Valley Research Inc., USA), MaxilactL2000 lactase (DSM, Holland) and Godo YNL (Godo Shusei Company, Japan).Optimum hydrolysis conditions depend on the used enzyme and they can beobtained from the manufacturers of the commercial enzymes.

In the step of cutting the formed product mass into desired form, suchas a block, a cube, a mince, a stripe, a grain or a slice, for example,in the process of the present invention, the formulation is done usingmethods and equipment known to a person skilled in the art.

In step of the seasoning and/or packing the product in the process ofthe present invention, the product is seasoned and/or packed usingmethods and equipment known to a person skilled in the art. The productcan be brined or salted with dry salt. Salt can be NaCl, KCl,Na-carbonate, sodium hydrogen phosphate, AIV-mix or a milk-based mineralproduct (dry or liquid, concentrate, brine), or a mixture thereof. Themilk-based mineral product refers to, for example, a salt described inpublication EP 1061811 B1, i.e. a milk mineral powder known as trademarkValio Milk Mineral Powder VMMP (Valio Oy). Other feasible milk-basedmineral products include trademarks such as Capolac® MM-0525 BG (ArlaFoods Ingredients), Vitalarmor CA (Armor Proteins) and Sodidiet 40 Ml(Sodiaal Industrie). The product can be seasoned with spices, herbs,fruits and/or vegetables.

The process of the invention may further contain additional optionalprocess steps, such as adding further ingredients, such as fats, oilsand/or emulsifiers, other protein and/or amino acid sources such asplant based proteins, and/or a further-processing step, for instancerecovering the product in a manner characteristic to it. These optionalsteps are performed in an appropriate stage of the process known by aperson skilled in the art. The selection of suitable optional steps andconditions belongs to knowledge of a person skilled in the art.

In one embodiment, the process of the invention comprises a step ofproviding a fat and/or oil. In one embodiment, the process of theinvention contains a step of mixing a fat and/or oil with the crumbledcheese, the hydrocolloid raw material and optionally the caseinconcentrate. In one embodiment, the process of the invention comprisessteps of providing a fat and/or oil and mixing the fat and/or oil withthe crumbled cheese, the hydrocolloid raw material and optionally thecasein concentrate. In one embodiment, the fat is selected from creamand butter or a mixture thereof. In one embodiment, the oil is selectedfrom vegetables oils such as, rape oil, sunflower oil, olive oil, or amixture thereof.

In one embodiment, the process of the invention comprises a step ofproviding a plant based protein. In one embodiment, the process of theinvention contains a step of mixing a plant based protein with thecrumbled cheese, the hydrocolloid raw material and optionally the caseinconcentrate. In one embodiment, the process of the invention comprisesthe steps of providing a plant based protein and mixing the plant basedprotein with the crumbled cheese, the hydrocolloid raw material andoptionally the casein concentrate. In one embodiment, the plant basedprotein is selected from wheat protein, oat protein, soy protein, potatoprotein, lupine protein, flax protein, hemp protein, corn protein barleyprotein, rye protein, pea protein, bean protein, spirulina protein, or amixture thereof.

The present invention relates also to a heat stable milk proteinproduct, in the form a block, a cube, a mince, a grain, a slice, astripe or block or filet pressed or processed from the cubes, minces,stripes, grains and/or slices. In one embodiment, the heat stableprotein product of the present invention refers to a meat substitute ora meat analogue.

The heat stable milk protein product has a microstructure which is innanolevel fibrous. The fibrous structure contains crosslinked caseinproteins. Crosslinked casein proteins contain covalent blocking bondswhich are not broken by heat, thus the heat-stability of the product isimproved. Furthermore, crosslinked casein improves water binding in thestructure and water is retained in the structure also during heating.The structure does not collapse when heated. Crosslinked caseinstructure creates a large number of narrow capillars, which retain watermolecules inside the structure.

The crosslinked casein protein molecules are at least dimers, but canalso be trimers or polymers. In one embodiment the crosslinked caseinprotein molecules are, for example, over 30 kDa or over 50 kDa in size.

It can clearly be seen from the SDS-PAGE analysis how thetransglutaminase has crosslinked casein proteins as well as smallerproteins formed during the cheese process (sample 1). The crosslinkedproteins are molecules having a size of about 100 to 300 kDa. The sample1, which was produced using transglutaminase, was heat stable and didnot melt when heated on a frying pan whereas samples 2 and 3, which wereproduced without transglutaminase, melted. Without wishing to be boundby a theory, the crosslinked protein molecules having the size of about100 to 300 kDa and the changes in their molecular sizes due to theeffect of transglutaminase transforms the casein proteins and thesmaller proteins formed during the cheese process from monomers to di-and trimers and possible up to polymers. The change in the molecularsize of these proteins freezes the proteins and the heat inducedmovement of the molecules diminishes.

The protein content of the heat stable milk protein product can vary inthe range of about 10% to about 55%. In an embodiment, the proteincontent is about 20% to about 50%. In an embodiment, the protein contentis about 23% to about 26%.

The fat content of the heat stable milk protein product can vary withina range of about 0% to about 20%. In one embodiment, the fat content iswithin a range of about 5% to about 7.5%.

In one embodiment, the protein content of the heat stable milk proteinis about 10% to about 55% or about 20% to about 50% or about 23% toabout 26% and the fat content of the product in the range of about 0% toabout 20% or about 5% to about 7.5%.

The lactose content of the heat stable milk protein product can varywithin the range of about 0% to about 5%.

In one embodiment, the protein content of the heat stable milk proteinproduct is about 10% to about 55% or about 20% to about 50% or about 23%to about 26% and the lactose content of the product is from about 0% toabout 5%.

In one embodiment, the protein content of the heat stable milk proteinproduct is from about 10% to about 55% or from about 20% to about 50% orfrom about 23% to about 26%, the fat content of the product is fromabout 0% to about 20% or from about 5% to about 7.5% and the lactosecontent of the product is from about 0% to about 5%.

The pH of the heat stable milk protein product is in the range of about5.2 to about 5.9. In an embodiment, the pH of product is about 5.2 toabout 5.5.

In one embodiment, the protein content of the heat stable milk proteinproduct is about 10% to about 55% or about 20% to about 50% or about 23%to about 26% and the pH of the product is about 5.2 to about 5.9 orabout 5.2 to about 5.5.

In one embodiment, the protein content of the heat stable milk proteinproduct is about 10% to about 55% or about 20% to about 50% or about 23%to about 26%, the lactose content of the product is from about 0% toabout 5% and the pH of the product is about 5.2 to about 5.9 or about5.2 to about 5.5.

In one embodiment, the protein content of the heat stable milk proteinproduct is from about 10% to about 55% or from about 20% to about 50% orfrom about 23% to about 26%, the fat content of the product is fromabout 0% to about 20% or from about 5% to about 7.5%, the lactosecontent of the product is from about 0% to about 5% and the pH of theproduct is about 5.2 to about 5.9 or about 5.2 to about 5.5.

The protein product of the invention can be in form of a block or afillet or a cube, a grain or a slice. The protein product can beconsumed as such or heated, fried, grilled or cooked. The product doesnot melt and/or clump together when fried on a hot fry-pan or a grill orwhen heated with microwaves. Thus, the protein product of the presentinvention is heat stable. The product can also be frozen before fryingwhile staying heat stable.

The following examples are presented for further illustration of theinvention without limiting the invention thereto.

EXAMPLES Example 1 Preparation of the Cheese

Raw milk was separated and standardized to have a fat content of 1%.Then, the milk was pasteurized at 72° C. for 15 s, cooled to atemperature of 33° C. and pumped into a cheese vat. About 0.04% byweight of CaCl2-solution (34%), about 0.05% rennet and a starter culture(DVS CH-N19) were added to the warm milk and mixed thoroughly with themilk. The mixture was allowed to curdle for about 30 minutes. Thecurdled milk was cut into grains with a cutting tool in the cheese vat.The grains were heated up to a temperature of 40° C. during about 100minutes while stirring all the time. After this, the whey was separatedfrom the grains and the grains were pressed into cheese blocks for aperiod of 14 hours (prepressing 4 h and repressing 10 h). After thepressing, the cheese was brined for 14 hours after which the cheese wasripened for about 21 days at a temperature of 11° C.

Example 2 Preparation of the Casein Concentrate

Raw milk was separated and the obtained skimmed milk was pasteurized at72° C. for 15 s and cooled. The cooled skimmed milk was microfiltered ata temperature of 50° C. to provide a casein fraction. The obtainedcasein fraction was concentrated by evaporation and dried into a powder.

Example 3 Preparation of a Heat Stable Milk Protein Product HavingProtein Content of 25.7% and Fat Content of 7%

The cheese prepared as described in Example 1 was crumbled. The crumbledcheese (21 kg), water (3 kg), the native casein concentrate powderprepared as described in Example 2 (1.5 kg) and calcium alginate (1.1kg) were mixed with a screw mixer (Karl Schnell) to provide a well-mixedmass. After this, the mass was heated with a direct steam up to atemperature of 75-95° C. in order to destroy the possible harmfulbacteria, enzymes and inhibitors. The heated mixture was cooledindirectly with cold water to a temperature of 55° C. while stirring themixture all the time. When the temperature is in the range of 40-55° C.,a transglutaminase enzyme (Ajinomoto Ltd, Japan) in an amount of 2 U/gprotein was added to the mass. After the addition of transglutaminase,the pH of the mass can be adjusted to the desired level (5.2-5.9) withan acid or a base. The cooled mass can then be formulated into thedesired form, such as a block, cubes or slices, for example, withappropriate machinery, such as mono pump and vacuum filler (VEMAGMaschinenbau GmbH). The milk protein product does not melt and/or clumptogether when fried on a hot fry-pan or a grill or when heated withmicrowaves. The product can also be frozen before frying and it staysheat stable. The pH of the product was adjusted to pH 5.2. The milkprotein product had protein content of 25.7%, fat content of 7%,carbohydrate content of 3.7%, ash content of 4.4%, about 9500 mg/kgcalcium and about 7100 mg/kg sodium.

Example 4 Preparation of a Heat Stable Milk Protein Product HavingProtein Content of 23.3% and Fat Content of 7.5%

The cheese prepared as described in Example 1 was crumbled. The crumbledcheese (22.5 kg), water (3.4 kg) and calcium alginate (1.1 kg) weremixed with a screw mixer (Karl Schnell) to provide a well-mixed mass.After this, the mass was heated with a direct steam up to a temperatureof 80-90° C. in order to destroy the possible harmful bacteria, enzymesand inhibitors. The heated mixture was cooled indirectly with cold waterto a temperature of 55° C. while stirring the mixture all the time. Whenthe temperature is in the range of 40-55° C., a transglutaminase enzyme(Ajinomoto Ltd, Japan) in an amount of 2 U/g protein was added to themass.

After the addition of transglutaminase, the pH of the mass can beadjusted to the desired level (5.2-5.9) with an acid or a base. Thecooled mass can then be formulated into the desired form, such as ablock, cubes or slices, for example, with appropriate machinery, such asmono pump and vacuum filler (VEMAG Maschinenbau GmbH). The milk proteinproduct does not melt and/or clump together when fried on a hot fry-panor a grill or when heated with microwaves. The product can also befrozen before frying and it stays heat stable. The pH of the product wasadjusted to pH 5.2. The milk protein product had protein content of23.3% and fat content of 7.5%.

Example 5 Preparation of a Heat Stable Milk Protein Product HavingProtein Content of 20.0% and Fat Content of 5.1%

The cheese prepared as described in Example 1 was crumbled. The crumbledcheese (15 kg), water (8.7 kg), the native casein concentrate powderprepared as described in Example 2 (1.5 kg) and sodium alginate (1.1 kg)were mixed with a screw mixer (Karl Schnell) to provide a well-mixedmass. After this, the mass was heated with a direct steam up to atemperature of 75-95° C. in order to destroy the possible harmfulbacteria, enzymes and inhibitors. The heated mixture was cooledindirectly with cold water to a temperature of 55° C. while stirring themixture all the time. When the temperature is in the range of 40-55° C.,a transglutaminase enzyme (Ajinomoto Ltd, Japan) in an amount of 2 U/gprotein was added to the mass. After the addition of transglutaminase,the pH of the mass can be adjusted to the desired level (5.2-5.9) withan acid or a base. The cooled mass can then be formulated into thedesired form, such as a block, cubes or slices, for example, withappropriate machinery, such as mono pump and vacuum filler (VEMAGMaschinenbau GmbH). The milk protein product does not melt and/or clumptogether when fried on a hot fry-pan or a grill or when heated withmicrowaves. The product can also be frozen before frying and it staysheat stable. The pH of the product was adjusted to pH 5.3. The milkprotein product had protein content of 20.0% and fat content of 5.1%.

Example 6 Preparation of a Heat Stable Milk Protein Product HavingProtein Content of 22.4% and Fat Content of 20%

The cheese prepared as described in Example 1 was crumbled. The crumbledcheese (18.1 kg), water (1.3 kg), the native casein concentrate powderprepared as described in Example 2 (1.4 kg), butter (5.1 kg) and calciumalginate (1.1 kg) were mixed with a screw mixer (Karl Schnell) toprovide a well-mixed mass. After this, the mass was heated with a directsteam up to a temperature of 75-95° C. in order to destroy the possibleharmful bacteria, enzymes and inhibitors. The heated mixture was cooledindirectly with cold water to a temperature of 55° C. while stirring themixture all the time. When the temperature is in the range of 40-55° C.,a transglutaminase enzyme (Ajinomoto Ltd, Japan) in an amount of 2 U/gprotein was added to the mass. After the addition of transglutaminase,the pH of the mass can be adjusted to the desired level (5.2-5.9) withan acid or a base. The cooled mass can then be formulated into thedesired form, such as a block, cubes or slices, for example, withappropriate machinery, such as mono pump and vacuum filler (VEMAGMaschinenbau GmbH). The milk protein product does not melt and/or clumptogether when fried on a hot fry-pan or a grill or when heated withmicrowaves. The product can also be frozen before frying and it staysheat stable. The pH of the product was adjusted to pH 5.2. The milkprotein product had protein content of 22.4% and fat content of 20.0%.

Example 7 Preparation of a Heat Stable Milk Protein Product HavingProtein Content of 26.5% and Fat Content of 6.0%

The cheese prepared as described in Example 1 was crumbled. The crumbledcheese (18 kg), water (5 kg), the native casein concentrate powderprepared as described in Example 2 (1.5 kg), wheat protein (1.5 kg) andcalcium alginate (1.1 kg) were mixed with a screw mixer (Karl Schnell)to provide a well-mixed mass. Wheat protein can be replaced, alsopartly, with oat protein. After this, the mass was heated with a directsteam up to a temperature of 75-95° C. in order to destroy the possibleharmful bacteria, enzymes and inhibitors. The heated mixture was cooledindirectly with cold water to a temperature of 55° C. while stirring themixture all the time. When the temperature is in the range of 40-55° C.,a transglutaminase enzyme (Ajinomoto Ltd, Japan) in an amount of 2 U/gprotein was added to the mass. After the addition of transglutaminase,the pH of the mass can be adjusted to the desired level (pH 5.2-5.9)with an acid or a base. The pH of the milk protein product was adjustedto the desired level (5.2-5.9) with an acid or a base. The cooled masscan then be formulated into the desired form, such as a block, cubes orslices, for example, with appropriate machinery, such as mono pump andvacuum filler (VEMAG Maschinenbau GmbH). The milk protein product doesnot melt and/or clump together when fried on a hot fry-pan or a grill orwhen heated with microwaves. The product can also be frozen beforefrying and it stays heat stable. The pH of the product was adjusted topH 5.2. The milk protein product has protein content of 26.5% and fatcontent of 6.0%.

Example 8 Preparation of a Heat Stable Milk Protein Product HavingProtein Content of 23.8% and Fat Content of 6.3%

The cheese prepared as described in Example 1 was crumbled. The crumbledcheese (18 kg), water (4.9 kg), the native casein concentrate powderprepared as described in Example 2 (1.5 kg), calcium alginate (1.1 kg),chili and paprika flavor ingredients and salt (0.1 kg) were mixed with ascrew mixer (Karl Schnell) to provide a well-mixed mass. After this, themass was heated with a direct steam up to a temperature of 75-95° C. inorder to destroy the possible harmful bacteria, enzymes and inhibitors.The heated mixture was cooled indirectly with cold water to atemperature of 55° C. while stirring the mixture all the time. When thetemperature is in the range of 40-55° C., a transglutaminase enzyme(Ajinomoto Ltd, Japan) in an amount of 2 U/g protein was added to themass. After the addition of transglutaminase, the pH of the mass can beadjusted to the desired level (5.2-5.9) with an acid or a base. Thecooled mass can then be formulated into the desired form, such as ablock, cubes or slices, for example, with appropriate machinery, such asmono pump and vacuum filler (VEMAG Maschinenbau GmbH). The milk proteinproduct does not melt and/or clump together when fried on a hot fry-panor a grill or when heated with microwaves. The product can also befrozen before frying and it stays heat stable. The pH of the product wasadjusted to pH 5.2. The milk protein product has protein content of23.8% and fat content of 6.3%.

Example 9 Preparation of a Heat Stable Milk Protein Product HavingProtein Content of 19.6% and Fat Content of 6.9%

The cheese prepared as described in Example 1 was crumbled.

A microfiltered casein concentrate was prepared from pasteurized andcooled skimmed milk by microfiltering and then ultrafiltering theretentate obtained from the microfiltration with concentration factor 3.The casein concentrate had the following composition: total protein9.15%, casein proteins 8.49%, carbohydrates 0.7%, lactose 0.4%, calcium2500 mg/kg, sodium 80 mg/kg, iodine 24 ng/g, ash 0.85%, fat 0.08%.

The crumbled cheese (20.6 kg), water (5 kg), the microfiltered caseinconcentrate (5.3 kg) and calcium alginate (1.1 kg) were mixed with ascrew mixer (Karl Schnell) to provide a well-mixed mass. After this, themass was heated with a direct steam up to a temperature of 75-95° C. inorder to destroy the possible harmful bacteria, enzymes and inhibitors.The heated mixture was cooled indirectly with cold water to atemperature of 55° C. while stirring the mixture all the time. When thetemperature is in the range of 40-55° C., a transglutaminase enzyme(Ajinomoto Ltd, Japan) in an amount of 2 U/g protein was added to themass. After the addition of transglutaminase, the pH of the mass can beadjusted to the desired level (5.2-5.9) with an acid or a base. Thecooled mass can then be formulated into the desired form, such as ablock, cubes or slices, for example, with appropriate machinery, such asmono pump and vacuum filler (VEMAG Maschinenbau GmbH). The milk proteinproduct does not melt and/or clump together when fried on a hot fry-panor a grill or when heated with microwaves. The product can also befrozen before frying and it stays heat stable. The pH of the product wasadjusted to pH 5.3 The milk protein product has protein content of 19.6%and fat content of 6.9%.

Example 10 Preparation of a Heat Stable Milk Protein Product HavingProtein Content of 25.7% and Fat Content of 7.0%

In the present example, a cheese prepared as disclosed in Example 1, butripened for about 90 days at a temperature of 11° C., was crumbled. Thecrumbled cheese (21 kg), water (3.4 kg), the native casein concentratepowder prepared as described in Example 2 (1.5 kg), and calcium alginate(1.1 kg) were mixed with a screw mixer (Karl Schnell) to provide awell-mixed mass. After this, the mass was heated with a direct steam upto a temperature of 75-95° C. in order to destroy the possible harmfulbacteria, enzymes and inhibitors. The heated mixture was cooledindirectly with cold water to a temperature of 55° C. while stirring themixture all the time. When the temperature is in the range of 40-55° C.,a transglutaminase enzyme (Ajinomoto Ltd, Japan) in an amount of 2 U/gprotein was added to the mass. After the addition of transglutaminase,the pH of the mass can be adjusted to the desired level (5.2-5.9) withan acid or a base. The cooled mass can then be formulated into thedesired form, such as a block, cubes or slices, for example, withappropriate machinery, such as mono pump and vacuum filler (VEMAGMaschinenbau GmbH). The milk protein product does not melt and/or clumptogether when fried on a hot fry-pan or a grill or when heated withmicrowaves. The product can also be frozen before frying and it staysheat stable. The pH of the product was adjusted to pH 5.2. The milkprotein product has protein content of 25.7%, fat content of 7.0%,carbohydrate content of 3.7%, ash content of 4.4%, about 9500 mg/kgcalcium and about 7100 mg/kg sodium.

Example 11 Preparation of a Heat Stable Milk Protein Product HavingProtein Content of 25.7% and Fat Content of 7.0%

In the present example, a cheese prepared as disclosed in Example 1, butripened for about 180 days at a temperature of 11° C., was crumbled. Thecrumbled cheese (21 kg), water (3.4 kg), the native casein concentratepowder prepared as described in Example 2 (1.5 kg), and calcium alginate(1.1 kg) were mixed with a screw mixer (Karl Schnell) to provide awell-mixed mass. After this, the mass was heated with a direct steam upto a temperature of 75-95° C. in order to destroy the possible harmfulbacteria, enzymes and inhibitors. The heated mixture was cooledindirectly with cold water to a temperature of 55° C. while stirring themixture all the time. When the temperature is in the range of 40-55° C.,a transglutaminase enzyme (Ajinomoto Ltd, Japan) in an amount of 2 U/gprotein was added to the mass. After the addition of transglutaminase,the pH of the mass can be adjusted to the desired level (pH 5.2-5.9)with an acid or a base. The pH of the product was adjusted to thedesired level (5.2-5.9) with an acid or a base. The cooled mass can thenbe formulated into the desired form, such as a block, cubes or slices,for example, with appropriate machinery, such as mono pump and vacuumfiller (VEMAG Maschinenbau GmbH). The milk protein product does not meltand/or clump together when fried on a hot fry-pan or a grill or whenheated with microwaves. The product can also be frozen before frying andit stays heat stable. The pH of the product was adjusted to pH 5.3 Themilk protein product has protein content of 25.7%, fat content of 7.0%,carbohydrate content of 3.5%, ash content of 4.4%, about 9500 mg/kgcalcium and about 7200 mg/kg sodium.

Example 12 Preparation of a Heat Stable Milk Protein Product HavingProtein Content of 25.7% and Fat Content of 7.0%

In the present example, a cheese prepared as disclosed in Example 1, butripened for about 270 days at a temperature of 11° C., was crumbled. Thecrumbled cheese (21 kg), water (3.4 kg), the native casein concentratepowder prepared as described in Example 2 (1.5 kg), and calcium alginate(1.1 kg) were mixed with a screw mixer (Karl Schnell) to provide awell-mixed mass. After this, the mass was heated with a direct steam upto a temperature of 75-95° C. in order to destroy the possible harmfulbacteria, enzymes and inhibitors. The heated mixture was cooledindirectly with cold water to a temperature of 55° C. while stirring themixture all the time. When the temperature is in the range of 40-55° C.,a transglutaminase enzyme (Ajinomoto Ltd, Japan) in an amount of 2 U/gprotein was added to the mass. After the addition of transglutaminase,the pH of the mass can be adjusted to the desired level (5.2-5.9) withan acid or a base. The cooled mass can then be formulated into thedesired form, such as a block, cubes or slices, for example, withappropriate machinery, such as mono pump and vacuum filler (VEMAGMaschinenbau GmbH). The milk protein product does not melt and/or clumptogether when fried on a hot fry-pan or a grill or when heated withmicrowaves. The product can also be frozen before frying and it staysheat stable. The pH of the product was adjusted to pH 5.2. The milkprotein product has protein content of 25.7% and fat content of 7.0%.

Example 13 Preparation of a Heat Stable Milk Protein Product HavingProtein Content of 53.6% and Fat Content of 0.1%

The cheese prepared as described in Example 1 was crumbled. The crumbledcheese (0.3 kg), water (5.6 kg), the native casein concentrate powderprepared as described in Example 2 (20 kg) and calcium alginate (1.1 kg)were mixed with a screw mixer (Karl Schnell) to provide a well-mixedmass. After this, the mass was heated with a direct steam up to atemperature of 75-95° C. in order to destroy the possible harmfulbacteria, enzymes and inhibitors. The heated mixture was cooledindirectly with cold water to a temperature of 55° C. while stirring themixture all the time. When the temperature is in the range of 40-55° C.,a transglutaminase enzyme (Ajinomoto Ltd, Japan) in an amount of 2 U/gprotein was added to the mass. After the addition of transglutaminase,the pH of the mass can be adjusted to the desired level (5.2-5.9) withan acid or a base. The cooled mass can then be formulated into thedesired form, such as a block, cubes or slices, for example, withappropriate machinery, such as mono pump and vacuum filler (VEMAGMaschinenbau GmbH). The milk protein product does not melt and/or clumptogether when fried on a hot fry-pan or a grill or when heated withmicrowaves. The product can also be frozen before frying and it staysheat stable. The pH of the product was adjusted to pH 5.2. The milkprotein product has protein content of 53.6% and fat content of 0.1%.

Example 14 Preparation of a Heat Stable Milk Protein Product HavingProtein Content of 25% and Fat Content of 7%

The cheese prepared as described in Example 1 was crumbled. The crumbledcheese (21.0 kg), water (4.35 kg), the native casein concentrate powderprepared as described in Example 2 (1.5 kg) and calcium alginate (0.15kg) were mixed with a screw mixer (Karl Schnell) to provide a well-mixedmass. After this, the mass was heated with a direct steam up to atemperature of 75-95° C. in order to destroy the possible harmfulbacteria, enzymes and inhibitors. The heated mixture was cooledindirectly with cold water to a temperature of 55° C. while stirring themixture all the time. When the temperature is in the range of 40-55° C.,a transglutaminase enzyme (Ajinomoto LtD, Japan) in an amount of 2 U/gprotein was added to the mass. After the addition of transglutaminase,the pH of the mass can be adjusted to the desired level (5.2-5.9) withan acid or a base. The cooled mass can then be formulated into thedesired form, such as a block, cubes or slices, for example, withappropriate machinery, such as mono pump and vacuum filler (VEMAGMaschinenbau GmbH). The milk protein product does not melt and/or clumptogether when fried on a hot fry-pan or a grill or when heated withmicrowaves. The product can also be frozen before frying and it staysheat stable. The pH of the product was adjusted to pH 5.2. The milkprotein product has protein content of 25.7% and fat content of 7.0%.

Example 15 Preparation of a Heat Stable Milk Protein Product HavingProtein Content of 25.7% and Fat Content of 7%

The cheese prepared as described in Example 1 was crumbled. The crumbledcheese (21.0 kg), water (1.5 kg), the native casein concentrate powderprepared as described in Example 2 (1.5 kg) and calcium alginate (3.0kg) were mixed with a screw mixer (Karl Schnell) to provide a well-mixedmass. After this, the mass was heated with a direct steam up to atemperature of 75-95° C. in order to destroy the possible harmfulbacteria, enzymes and inhibitors. The heated mixture was cooledindirectly with cold water to a temperature of 55° C. while stirring themixture all the time. When the temperature is in the range of 40-55° C.,a transglutaminase enzyme (Ajinomoto Ltd, Japan) in an amount of 2 U/gprotein was added to the mass. After the addition of transglutaminase,the pH of the mass can be adjusted to the desired level (5.2-5.9) withan acid or a base. The cooled mass can then be formulated into thedesired form, such as a block, cubes or slices, for example, withappropriate machinery, such as mono pump and vacuum filler (VEMAGMaschinenbau GmbH). The milk protein product does not melt and/or clumptogether when fried on a hot fry-pan or a grill or when heated withmicrowaves. The product can also be frozen before frying and it staysheat stable. The pH of the product was adjusted to pH 5.3. The milkprotein product has protein content of 25.7%, fat content of 7.0%,carbohydrate content of 3.7%, ash content of 4.4%, about 9500 mg/kgcalcium and 7100 mg/kg sodium.

Example 16 Preparation of a Heat Stable Milk Protein Product HavingProtein Content of 23.7% and Fat Content of 14% Using Laccase

The cheese prepared as described in Example 1 was crumbled. The crumbledcheese (21 kg), water (3 kg), butter (3.0 kg), the native caseinconcentrate powder prepared as described in Example 2 (1.5 kg) andcalcium alginate (1.1 kg) were mixed with a screw mixer (Karl Schnell)to provide a well-mixed mass. After this, the mass was heated with adirect steam up to a temperature of 75-95° C. in order to destroy thepossible harmful bacteria, enzymes and inhibitors. The heated mixturewas cooled indirectly with cold water to a temperature of 45° C. whilestirring the mixture all the time. When the temperature is in the rangeof 40-45° C., a laccase enzyme produced by Trametes hirsuta in an amountof 7 U/g protein was added to the mass. After the addition of laccase,the pH of the mass can be adjusted to the desired level (5.2-5.9) withan acid or a base. The cooled mass can then be formulated into thedesired form, such as a block, cubes or slices, for example, withappropriate machinery, such as mono pump and vacuum filler (VEMAGMaschinenbau GmbH). The milk protein product does not melt and/or clumptogether when fried on a hot fry-pan or a grill or when heated withmicrowaves. The product can also be frozen before frying and it staysheat stable. The milk protein product had a protein content of 23.7% anda fat content of 14.0%.

Example 17 Preparation of a Heat Stable Milk Protein Product HavingProtein Content of 25.7% and Fat Content of 7% Using Tyrosinase

The cheese prepared as described in Example 1 was crumbled. The crumbledcheese (21.0 kg), calcium alginate (2.5 kg), water (2.0 kg) and thenative casein concentrate powder prepared as described in Example 2 (1.5kg) were mixed with a screw mixer (Karl Schnell) to provide a well-mixedmass. After this, the mass was heated with a direct steam up to atemperature of 75-95° C. in order to destroy the possible harmfulbacteria, enzymes and inhibitors. The heated mixture was cooledindirectly with cold water to a temperature of 40° C. while stirring themixture all the time. When the temperature was approximately 40° C., atyrosinase enzyme produced by Trichoderma reesei in an amount of 8 U/gprotein was added to the mass. After the addition of tyrosinase, the pHof the mass can be adjusted to the desired level (5.2-5.9) with an acidor a base. The cooled mass can then be formulated into the desired form,such as a block, cubes or slices, for example, with appropriatemachinery, such as mono pump and vacuum filler (VEMAG MaschinenbauGmbH). The milk protein product does not melt and/or clump together whenfried on a hot fry-pan or a grill or when heated with microwaves. Theproduct can also be frozen before frying and it stays heat stable. ThepH of the product was adjusted to pH 5.2. The milk protein product has aprotein content of 25.7% and a fat content of 7.0%. It will be obviousto a person skilled in the art that, as the technology advances, theinventive concept can be implemented in various ways. The invention andits embodiments are not limited to the examples described above but mayvary within the scope of the claims.

The invention claimed is:
 1. A process for manufacturing a heat stablemilk protein product, wherein the process comprises the steps of: a)providing a cheese b) providing a native casein concentrate, c)providing a hydrocolloid raw material, d) providing a proteincrosslinking enzyme, e) crumbling the cheese, f) mixing the crumbledcheese, the hydrocolloid raw material and the native casein concentrate,g) subjecting the mixture to a temperature from about 60° C. to about95° C. for a period of time from about 2 minutes to about 2 hours toform a heat treated mixture, h) cooling the heat treated mixture to atemperature from about 5° C. to about 55° C. while mixing, i) adding aprotein crosslinking enzyme to the mixture to form a product mass, j)optionally adding a lactase to the mixture, k) optionally adjusting thepH of the product to a range of 5.2 to 5.9, l) optionally cutting theformed product mass into desired form, such as a block, a cube, astripe, a mince, a grain or a slice, m) optionally seasoning and/orpacking the product mass.
 2. The process of claim 1, wherein the nativecasein concentrate is provided in a powder form.
 3. The process of claim1, wherein the protein crosslinking enzyme is selected fromtransglutaminase, tyrosinase and laccase.
 4. The process of claim 1,wherein the hydrocolloid is calcium alginate or sodium alginate.